If you're getting an extra blank page at the beginning of your report, you probably have some spaces or something in the BODY of your header/footer document, since anything in the body of your header/footer document (accessed in page setup) would now end up being the first page of your printout, followed by other attachments or items.

At preview or print time, the program opens the Header/footer document , and merges the entire final report content, including attached documents, index, etc into it.  Each separate attachment is inserted as a separate item/page in the combined printout.

Solution: Use File > Page Setup to customize your Header/Footer document.  If you remove any information from the body of that document, that should solve the problem. If the page you're getting is blank, the information is probably an invisible character such as a space or carriage return. If you don't spot any obvious information, use View > Display control codes to "see" invisible characters so you can easily delete them. After saving the document, preview to verify the problem is resolved.

If the blank page is before the report body, it might be caused by something in the body of the header/footer document per the above information.

If instead the blank page is after a few pages, perhaps after the index or other document or at the end of the report, it could be the last items on the preceding page is hitting almost exactly on your bottom margin, thus creating a blank page.  If the last item before the blank page is an attachment, you might open it and use the View menu to display control codes so you can see any invisible characters there like spaces or carriage returns the might be using space, and if so delete them. (if extra space is in the master, edit and do so likewise there).

If  it turns out a rare scenario where the body of the report is on the margin edge for that report, perhaps go up a couple fields in the report and use CTRL+Enter to add a hard page break, so the last page has a few items on it.